The Gehl R190 skid steer loader uses a digital gauge cluster with indicator lights to monitor engine, hydraulic, and safety systems. This guide helps operators quickly interpret warnings specific to the R190, which shares many components with other Gehl models but has unique hydraulic and engine configurations.
Gehl R190 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault detected on your R190, such as low engine oil pressure or high coolant temperature. | Stop the engine immediately and check the secondary warning lights to identify the cause. | |
| Master Caution | AMBER | A non-critical system requires attention on your R190, like a clogged air filter or low hydraulic oil level. | Review other warning indicators and schedule service soon. | |
| Check Engine (MIL) | AMBER | The R190's engine management system has detected a fault, often related to emissions or fuel system. | Have the engine diagnosed using the onboard diagnostic code reader or a dealer service tool. | |
| Engine Oil Pressure | RED | Engine oil pressure is below safe operating level in your R190, risking engine damage. | Stop the engine immediately and check oil level; if full, contact a service center. | |
| Battery / Charging | RED | The R190's charging system is not providing adequate voltage, possibly due to alternator or belt failure. | Check alternator belt tension and battery connections; if light stays on, service charging system. | |
| Coolant Temperature | RED | Engine coolant temperature is too high on your R190, which could lead to overheating. | Stop the engine, let it cool, then check coolant level and radiator for blockages. | |
| Parking Brake | AMBER | The R190's parking brake is engaged, or a fault exists in the brake system. | If parked, disengage brake; if light persists, inspect brake switch or system. | |
| Seat Belt | AMBER | Operator's seat belt is not fastened on the R190; machine functions may be limited. | Fasten the seat belt before operating the loader. | |
| Glow Plug / Preheat | AMBER | Glow plugs are active or a preheat cycle is needed for the R190's diesel engine. | Wait for the light to turn off before starting the engine in cold weather. | |
| Low Fuel | AMBER | Fuel level is critically low in your R190, risking engine stall. | Refuel as soon as possible to avoid running out during operation. | |
| High Beam | BLUE | High beam headlights are activated on the R190. | Dim to low beam when other equipment operators are approaching. | |
| Work Lights | GREEN | Front and/or rear work lights are turned on for the R190. | Turn off when not needed to conserve battery. | |
| Service / Hour Meter | AMBER | Scheduled maintenance interval is approaching or due on your R190. | Refer to the operator's manual for service required (e.g., oil change, filter replacement). | |
| Hydraulic System | RED | Hydraulic system fault detected on the R190, such as overheating or low pressure. | Stop the machine and check hydraulic oil level and temperature; allow to cool if hot. | |
| Air Filter | AMBER | Engine air filter is restricted on the R190, reducing performance. | Replace or clean the air filter element according to maintenance schedule. | |
| Hydraulic Oil | AMBER | Hydraulic oil level is low in your R190, possibly affecting lift and drive functions. | Check hydraulic oil reservoir and add recommended oil to proper level. | |
| Engine Oil Temperature | AMBER | Engine oil temperature is elevated on the R190, but not yet critical. | Reduce engine load and allow machine to cool; check oil level and cooling system. | |
| Water in Fuel | AMBER | Water has accumulated in the R190's fuel filter/water separator. | Drain the water from the fuel filter bowl or replace the fuel filter. | |
| Reduced Power (Limp Mode) | AMBER | The R190's engine has entered a derated mode to protect powertrain components. | Reduce load and travel to nearest service location; diagnostic code must be read. | |
| Fuel Filter / Water Separator | AMBER | Fuel filter is clogged or water separator needs draining on the R190. | Replace the fuel filter and/or drain water from the separator housing. |
20 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Low coolant level
- Radiator debris buildup
- Faulty thermostat or water pump
What to do
Stop the R190 immediately and allow the engine to cool. Check coolant level and add 50/50 mix. Clean radiator fins with compressed air. If recurring, inspect thermostat and water pump.
Hydraulic System Failure
Common causes
- Low hydraulic oil level
- Contaminated or degraded oil
- Failed hydraulic pump or relief valve
What to do
Park the R190 on level ground and check hydraulic oil level; add recommended fluid. If oil is milky or smells burnt, have hydraulic system flushed. A persistent red light may require pump or valve inspection.
Engine Oil Pressure Loss
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter or pickup tube
What to do
Shut down engine instantly. Verify oil level on dipstick; if low, add oil. If level is normal but light stays red, do not restart – tow R190 to service for oil pressure testing.
Charging System Failure
Common causes
- Loose or damaged alternator belt
- Alternator failure
- Battery terminal corrosion or loose connection
What to do
Check alternator belt tension; tighten or replace if worn. Clean battery terminals and tighten cables. If light continues, replace alternator or have charging system tested.
Transmission Overheat (if equipped)
Common causes
- Low transmission fluid
- Excessive load in high ambient temps
- Cooler bypass valve stuck
What to do
Reduce workload and shift to neutral to let transmission cool. Check fluid level with machine level. If light persists, inspect transmission cooler and valve.
Frequently Asked Questions
Why does the red master warning light come on after starting the R190?
On the R190, the master warning light illuminates briefly during the pre-start self-test. If it remains on after start, check the secondary warning lights (e.g., oil pressure, coolant temp) and stop the engine if a red indicator is active.
What should I do if the amber check engine light stays on?
The check engine light on your R190 indicates a fault in the Yanmar or other engine emissions system. It is safe to operate at reduced load, but you should retrieve diagnostic codes using a scanner or visit a Gehl dealer to prevent further issues.
How often should I change the hydraulic oil on the R190?
For the Gehl R190, the hydraulic oil and filter should be replaced every 1000 hours or annually, whichever comes first. Always use Gehl-approved hydraulic fluid (e.g., 10W-40 or specific part number).
Can I operate the R190 with the seatbelt warning light on?
No. The R190's safety interlock may limit lift and drive functions if the seat belt is not fastened. Buckle up before operating; if the light remains on after buckling, the seat belt switch may need adjustment.
What does the amber glow plug light mean in summer?
The glow plug light on the R190 may still briefly activate in warm weather to preheat the combustion chamber. If it stays on for more than 10 seconds, the glow plug relay or controller may need inspection.
The work lights on my R190 are flickering – what could be wrong?
Flickering work lights often indicate a loose ground connection or a faulty bulb. Check the light connectors behind the cab and ensure the ground terminals are clean. If all connections are secure, replace the LED or halogen bulbs.